"To lessen this difficulty a little, let it be considered how exceedingly different, to the eye of the mind, as we may say, are our ideas of sensible things from any thing that could have been conjectured concerning their effect upon us."
— Priestley, Joseph (1733-1804)
See Hartley’s Theory of the Human Mind, on the Principle of the Association of Ideas; With Essays Relating to the Subject of It. By Joseph Priestley, LL. D. F. R. S. (London: Printed for J. Johnson, No. 72, St. Paul’s Church-Yard, 1775). <Link to ESTC>